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Martha Raddatz named co-anchor of ABC's 'This Week'

ABC News has officially named Martha Raddatz co-anchor of "This Week", the network announced on Friday.

The news formalizes Raddatz's role with the show. She's been splitting hosting duties with George Stephanopoulos since Feb. 2014.

"George and Martha, who will continue to anchor alternate weekends, have successfully redefined Sunday mornings, often taking the show outside the studio," ABC News President James Goldston said in a memo.

Raddatz, who is also ABC News' chief global affairs correspondent and was co-moderator of a recent Democratic primary debate, will continue her international reporting while working on "This Week," which will keep its full title, "This Week with George Stephanopoulos."

"When something happens in the world, Martha’s first instinct is to get there. She is relentless and fearless in her drive to be as close to the story as possible. She’ll continue to report from the front lines to help our audience better understand the world," Goldston wrote.

Goldston also announced that Chief White House Correspondent Jonathan Karl will be the primary substitute for Stephanopoulos and Raddatz.